Phase correcting zone plate

Details Phase correcting zone plate Phase correcting zone plate

H - Electricity

01

Q

H01Q 19/06 (2006.01)

Patent

CA 2139761

2139761 9401900 PCTABS00030 A zone plate focusing radiation comprises a plurality of surface portions (20a, 20b, 20c, 20d, 30) corresponding to zones of the zone plate. The surface portions are positioned in a plurality P of parallel planes such that each surface portion diffracts radiation out of phase with respect to adjacent surface portions such that radiation diffracted by the surface portion constructively interferes at a focus of the zone plate. The Pth plane is dielectrically spaced from the first plane by n.lambda., where .lambda. is the wavelength of the radiation and n is an integer.

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